TY - JOUR AU - Simon, Csilla AU - Tóth, Zoltán TI - Jövőbeli kihívások meglévő rendszerek esetében. A környezeti tényezők változásának relevanciája az energiatermelésben TS - A környezeti tényezők változásának relevanciája az energiatermelésben JF - ELEKTROTECHNIKA J2 - ELEKTROTECHNIKA VL - 117 PY - 2024 IS - 3 SP - 18 EP - 20 PG - 3 SN - 0367-0708 UR - https://m2.mtmt.hu/api/publication/34789151 ID - 34789151 LA - Hungarian DB - MTMT ER - TY - CONF AU - Daoud, R.W. AU - Abdullah, Z.M. AU - Khudhur, K.A. AU - Ali, Zaid AU - Ahmed, O.K. AU - Al-Khashab, Y. ED - Ahmed, O.K. ED - Abdulrazzaq, N.M. TI - Fuzzy Based Control of Optimized Efficiency PV Array Power Production T2 - 2nd International Conference on Renewable Energy, ICRE 2022 VL - 2885 PB - American Institute of Physics (AIP) T3 - AIP Conference Proceedings, ISSN 0094-243X ; 2885. PY - 2024 IS - 1 DO - 10.1063/5.0182715 UR - https://m2.mtmt.hu/api/publication/34763420 ID - 34763420 N1 - Northern Technical University, Alhawija Technical Institute, Kirkuk, Iraq Northern Technical University, Kirkuk Technical College, Kirkuk, Iraq Budapest University of Technology and Economics, Budapest, Hungary Ministry of Water Resources, Mosul, Iraq Conference code: 197983 Export Date: 2 April 2024 Correspondence Address: Daoud, R.W.; Northern Technical University, Iraq; email: raid.daoud@gmail.com AB - The array of solar panels consists of a group of cells linked together to take advantage of solar energy and convert it into electrical energy. Several factors may affect this matrix's functioning, leading to a lack of efficiency and cell damage. In this work, a control system is designed and represented over the solar cell array, monitoring it and making appropriate decisions at the right moment in a flexible and mechanical harmony. Also, determining the factors affecting the cell’s functioning individually while, on the matrix directly affects the system's efficiency, such as the voltage level produced by the cell the voltage level produced by the matrix, and the temperature. Through the extrapolation of these factors, the appropriate treatment is activated to make the value of this factor within the default level, wherefrom the treatments took cooling, changing the angle of inclination, and cleaning of the surface of the solar cell will be stable at a specific. The proposed control system forces the cells to work with consistent data that do not change with changing conditions. © 2024 American Institute of Physics Inc.. All rights reserved. LA - English DB - MTMT ER - TY - CONF AU - Abdulmajeed, Hasan AU - Kiss, Péter ED - Ahmed, O.K. ED - Abdulrazzaq, N.M. TI - Impact of Shunt Active Power Filter SAPF on a Distribution Network: A Case Study T2 - 2nd International Conference on Renewable Energy, ICRE 2022 VL - 2885 PB - American Institute of Physics (AIP) T3 - AIP Conference Proceedings, ISSN 0094-243X ; 2885. PY - 2024 IS - 1 DO - 10.1063/5.0181595 UR - https://m2.mtmt.hu/api/publication/34763418 ID - 34763418 N1 - Conference code: 197983 Export Date: 2 April 2024 Correspondence Address: Abdulmajeed Salbi, H.A.; Department of Electric Power Engineering, Hungary; email: hasan.abdulmajeed@edu.bme.hu AB - Harmonic distortion generated by nonlinear loads is one of the major power quality problems for the distribution system and the consumers, like poor power factor, device overheating, neutral overloading, and machine vibrations. The conventional harmonic mitigation method (Passive Filter) sustains a lot of tunning, resonance, and size drawbacks. Shunt Active Power Filter (SAPF) can use as a feasible alternative device to mitigate the current harmonic distortion. This paper investigates the mitigation performance of three-phase three-wire SAPF on the proposed distribution network model during nonlinear load changes conditions (dynamic load changes) when five scenarios representing different load variations have been applied to the network. Total Harmonic Distortion (THD), current, and power factor have been examined before and after these load changes and without and with SAPF in each network bus. The study considers the dynamic load induction machine that has been connected to the one feeder through a line-side converter when SAPF was able to reduce the THD% of the grid to 5.32, 5.1, and 5.52 for 20Nm, 40Nm, and 60 Nm dynamic applied torque, respectively. The SAPF, distribution network, loads, and line side converter models are simulated with varying scenarios in MATLAB Simulink. © 2024 American Institute of Physics Inc.. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Saleh, Ameer Lateef AU - Al-Amyal, Fahad AU - Számel, László TI - Control techniques of switched reluctance motors in electric vehicle applications: A review on torque ripple reduction strategies JF - AIMS ELECTRONICS AND ELECTRICAL ENGINEERING J2 - AIMS ELECTRON ELECTRIC ENGIN VL - 8 PY - 2024 IS - 1 SP - 104 EP - 145 PG - 42 SN - 2578-1588 DO - 10.3934/electreng.2024005 UR - https://m2.mtmt.hu/api/publication/34763138 ID - 34763138 N1 - Export Date: 12 April 2024 Correspondence Address: Saleh, A.L.; Budapest University of Technology and Economics, Hungary; email: aalkalmashi@edu.bme.hu AB - As electric vehicles (EVs) continue to acquire prominence in the transportation industry, improving the outcomes and efficiency of their propulsion systems is becoming increasingly critical. Switched Reluctance Motors (SRMs) have become a compelling option for EV applications due to their simplicity, magnet-free design, robustness, and cost-effectiveness, making them an attractive choice for the growing EV market. Despite all these features and compared to other electrical machines, SRMs suffer from some restrictions, such as torque ripple and audible noise generation, stemming from their markedly nonlinear characteristics, which affect their productivity and efficiency. Therefore, to address these problems, especially the torque ripple, it is crucial and challenging to enhance the performance of the SRM drive system. This paper proposed a comprehensive review of torque ripple minimization strategies of SRMs in EV applications. It covered a detailed overview and categorized and compared many strategies, including two general categories of torque ripple mitigation encompassing optimization design topologies and control strategy developments. Then, focused on control strategy improvements and divided them into torque and current control strategies, including the sub-sections. In addition, the research also provided an overview of SRM fundamental operations, converter topologies, and excitation angle approaches. Last, a comparison between each method in torque control and current control strategies was listed, including the adopted method, features, and drawbacks. LA - English DB - MTMT ER - TY - JOUR AU - Számel, László AU - Oloo, Jackson TI - Monitoring of Stator Winding Insulation Degradation through Estimation of Stator Winding Temperature and Leakage Current JF - MACHINES J2 - MACHINES VL - 12 PY - 2024 IS - 4 PG - 18 SN - 2075-1702 DO - 10.3390/machines12040220 UR - https://m2.mtmt.hu/api/publication/34758408 ID - 34758408 N1 - Export Date: 3 May 2024 Correspondence Address: Oloo, J.; Department of Electric Power Engineering, Egry József Utca 18, Hungary; email: joloo@edu.bme.hu AB - Switched Reluctance Motors (SRMs), Permanent Magnet Synchronous Motors (PMSMs), and induction motors may experience failures due to insulation-related breakdowns. The SRM rotor is of a non-salient nature and made of solid steel material. There are no windings on the rotor. However, the stator is composed of windings that are intricately insulated from each other using materials such as enamel wire, polymer films, mica tapes, epoxy resin, varnishes, or insulating tapes. The dielectric strength of the insulation may fail over time due to several environmental factors and processes. Dielectric breakdown of the winding insulation can be caused by rapid switching of the winding current, the presence of contaminants, and thermal aging. For reliable and efficient operation of the SRMs and other electrical machines, it is necessary to take into account the physics of the winding insulation and perform appropriate diagnostics and estimations that can monitor the integrity of the insulation. This article presents the estimation problem using a Genetic Algorithm (GA)-optimized Random Forest Regressor. Empirical properties and measurable quantities in the historical data are utilized to derive temperature and leakage current estimation. The developed model is then combined with a moving average function to increase the accuracy of prediction of the stator winding temperature and leakage current. The performance of the model is compared with that of the Feedforward Neural Network and Long Short-Term Memory over the same winding temperature and leakage current historical data. The performance metrics are based on computation of the Mean Square Error and Mean Absolute Error. LA - English DB - MTMT ER - TY - CONF AU - Ali, Zaid AU - Raisz, Dávid TI - SMC-PWM of a dynamic performance voltage restorer T2 - 2nd International Conference on Renewable Energy, ICRE 2022 PB - AIP Publishing T3 - AIP Conference Proceedings, ISSN 0094-243X ; 2885. PY - 2024 PG - 10 DO - 10.1063/5.0181558 UR - https://m2.mtmt.hu/api/publication/34754570 ID - 34754570 LA - English DB - MTMT ER - TY - JOUR AU - Mulya, Kyle Sebastian AU - Ng, Wai Lam AU - Biró, Kinga AU - Ho, Wai Shin AU - Wong, Keng Yinn AU - Woon, Kok Sin TI - Decarbonizing the high-rise office building: A life cycle carbon assessment to green building rating systems in a tropical country JF - BUILDING AND ENVIRONMENT J2 - BUILD ENVIRON VL - 255 PY - 2024 PG - 11 SN - 0360-1323 DO - 10.1016/j.buildenv.2024.111437 UR - https://m2.mtmt.hu/api/publication/34753852 ID - 34753852 AB - The construction sector contributes a considerable share of global carbon emissions, with high-rise buildings having high emission density. Green Building Rating System (GBRS) certifications aim to reduce building emissions and improve occupant comfort. Most studies focus on low-to-mid-rise buildings, neglecting GBRS’ impact on commercial high-rises. Studies on the feasibility of adapting international GBRS to local high-rise buildings from a life cycle perspective are also scarce in tropical countries. Hence, taking Malaysia as a case study, this research quantifies the embodied and operational carbon reduction of GreenRE (local) and LEED (international) certifications on a high-rise office building using Life Cycle Assessment, where various certification tiers and scenarios are analyzed. LEED Platinum comprises 25.1% embodied (EC) and 74.9% operational carbon (OC) emissions, whereas GreenRE Platinum is 13.4% and 86.6%, respectively. Combining EC and OC emissions, LEED scenarios achieve reductions up to 61.1% with high OC reduction targets, while GreenRE offers up to 28.7% reduction with more stringent EC requirements. The LEED Max scenario, obtaining all available credits, achieves the highest carbon reduction of 65.1%. Unlike GreenRE, which specifies reductions from individual building components, LEED lacks specific requirements for components like lighting or cooling, potentially resulting in uneven emission reduction. Unconventional designs incorporating building-integrated photovoltaics, radiant cooling slabs, and other green features reduce carbon emissions by 62.7%. Recommendations to improve GBRS criteria towards achieving low-carbon buildings include relaxing the energy-related credit limit for GreenRE to reduce emissions by an additional 12.5% and incentivizing stakeholders to reduce EC in both LEED and GreenRE. © 2024 Elsevier Ltd LA - English DB - MTMT ER - TY - JOUR AU - BAL, Semih AU - Tamus, Zoltán Ádám TI - A Method for Assessing the Degradation of PVC-Insulated Low-Voltage Distribution Cables Exposed to Short-Term Cyclic Aging JF - ELECTRONICS (SWITZ) VL - 13 PY - 2024 IS - 6 PG - 20 SN - 2079-9292 DO - 10.3390/electronics13061085 UR - https://m2.mtmt.hu/api/publication/34741724 ID - 34741724 N1 - Export Date: 5 April 2024 Correspondence Address: Tamus, Z.Á.; Department of Electric Power Engineering, Hungary; email: tamus.adam@vik.bme.hu AB - The distribution grid comprises cables with diverse constructions. The insulating material used in low-voltage (LV) distribution cables is predominantly PVC. Furthermore, the presence of cables with different structures in the grid poses challenges in detecting the aging of the cable network. Finding a universal and dependable condition-monitoring technique that can be applied to various types of cables is indeed a challenge. The diverse construction and materials used in different cables make it difficult to identify a single monitoring approach that can effectively assess the condition of all cables. To address this issue, this study aims to compare the thermal aging behavior of different LV distribution cables with various structures, i.e., one cable contains a PVC belting layer, while the other contains filler material. The growing adoption of distributed generation sources, electric vehicles, and new consumer appliances in low-voltage distribution grids can lead to short, repetitive overloads on the low-voltage cable network. Hence, these cable samples were exposed to short-term cyclic accelerated aging in the climate chamber at 110 °C. The cable’s overall behavior under thermal stress was evaluated through frequency and time domain electrical measurements (including tan δ and extended voltage response) and a mechanical measurement (Shore D). The tan δ was measured in the frequency range of 20 Hz–500 kHz by using the Wayne-Kerr impedance analyzer. The extended voltage response measurement was conducted using a C# application developed in-house specifically for laboratory measurements in the .NET environment. The study observed a strong correlation between the different measurement methods used, indicating that electrical methods have the potential to be adopted as a non-destructive condition-monitoring technique. LA - English DB - MTMT ER - TY - JOUR AU - Molnár, Áron AU - Rácz, Levente AU - Németh, Bálint TI - A dinamikus távvezeték terhelhetőség pontosságának fejlesztése a széljelenségek vizsgálatával JF - ENERGIAGAZDÁLKODÁS J2 - ENERGIAGAZDÁLKODÁS VL - 65 PY - 2024 SP - 81 EP - 85 PG - 5 SN - 0021-0757 UR - https://m2.mtmt.hu/api/publication/34735217 ID - 34735217 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Orosz, Tamás AU - Rassõlkin, Anton AU - Arsénio, Pedro AU - Poór, Peter AU - Valme, Daniil AU - Sleisz, Ádám TI - Current Challenges in Operation, Performance, and Maintenance of Photovoltaic Panels JF - ENERGIES J2 - ENERGIES VL - 17 PY - 2024 IS - 6 PG - 22 SN - 1996-1073 DO - 10.3390/en17061306 UR - https://m2.mtmt.hu/api/publication/34727797 ID - 34727797 N1 - Export Date: 5 April 2024 Correspondence Address: Orosz, T.; Department of Power Electronics and Electric Drives, Hungary; email: orosz.tamas@sze.hu AB - The installed solar capacity in the European Union has expanded rapidly in recent years. The production of these plants is stochastic and highly dependent on the weather. However, many factors should be considered together to estimate the expected output according to the weather forecast so that these new PV plants can operate at maximum capacity. Plants must be operated in coordination with maintenance operations and considering actual energy market prices. Various methods have recently been developed in the literature, ranging from the most impactful artificial-intelligence-based generation estimation methods to various diagnostic and maintenance methods. Moreover, the optimal operational and maintenance strategy usually depends on market regulation, and there are many concerns related to the distribution system operator. This review article aims to summarize and illustrate the challenges of operating and maintaining solar power plants and the economic and technical importance of these problems. LA - English DB - MTMT ER -